Textile spindle and mounting



V W L.. E. KEENE Erm..

TEXTILE SPINDLE ma nomme.

Filed Oct. 11., l

iPatented Oct. 1.7,

TEXTILE SPINDLE AND MOUNTING Lester E. Keene, Newtonville, and Fausto G.De Santis, Quincy, Mau., assignors, by mesne assignments, toReconstruction Finance Corporation, Washington, D. C., a corporation ofthe United States Application October *11, 1949, Serial No. 120,746 I 11claims. (ci. s'z-isoi This invention relates to textile spindles, andmore particularly to an improved spindle structure and mounting forspindles of the type used in spinning and twister frames.

Spindles of this class are employed in considerable numbers mounted in avertical position in the above mentioned types oi textile machines forcarrying bobbins, tubes or the like on which are wound the yarn after ithas been subjected to its nal processing operation in such machines. Theyarn is built up usually in a progressive manner into fully woundpackages o! desired dimensions on the bobbins or tubes carried by thespindles; consequently, the spindles and their mountings are subjectedto overhanging loads of varying degrees of unbalance as the increasingamounts of yarn are wound onto the bobbin before the yarn mass reachesits final size and in the course of this winding operation the rotating`spindle structure normally passes through one or more of its principalcritical speeds. For practical operation, it is preferred that such aspindle be designed to have not more than two principal critical speeds,and that provision be madev in the spindle structure for` dampingoscillations or vibrations of the rotating spindle structure created notonly by the variations in unbalance of the yarn package being wound butalso those normally encountered in the course of accelerating thespindle from a state of rest to rotation at its normal operating speedwell above these critical speeds, and vice versa. l

In fact, textile spindles of this class usually require that the entirerotating assembly per se," without the bobbin and its yarn load, be veryaccurately balanced dynamically. as any substantial unbalance of theseparts may give riseto serious resonance phenomena which may set upexcessive vibrations of the rotating blade assembly in passing throughits principal critical speeds.

An object of the present invention is to construct a textile spindle ofthe "self-centering type, such that vibration and unbalanced loads willbe damped and the rotating spindle assembly thereof including theflexible blademem l fixed support or dead spindle upon the` upperportion of which is rotatably mounted the rotating spindle structureincluding ,the whorl and the blade tast therewith. the fixed support ordead 2 spindle being ilxedly secured to and supported by a tubularbolster which is telescopically arranged within and axiallyoccupies the'bore of a generally tubular base member with a loose fit and isflexibly anchored therewith for accommodating llmited lateral and radialmovements of` the bolster relative to the base member whereby at theusual operating speed oi the spindle the parts forming the entirerotating spindle structure will be enabled to rotate with theirprincipal axes in coincidence with the axis of rotation. Under thiscondition of rotation the unbalanced forcesand displacing couples actingon the rotating parts are eliminated. To attain this desirable operatingcondition, it willbe necessary that the mounting for the xed support ordead spindle be made sufllciently ilexlble and resilient to permit acertain amount of radial and lateral displacement of the bolster withinthe base from the axis of rotation of the rotating spindle structure andalso that suitable damping be provided to prevent the setting up ofexcessive vibrations by the rotating spindle assembly when passing itstwo principal critical speeds.

In order to damp or absorb the aforementioned detrimental vibrations andalso to enable the rotating parts to rotate at high speeds with theirprincipal axes in coincidence with the axis of rotation the presentinvention provides a combined damper, seal, and resilient mountorganization flexibly anchoring the bolster with` the or dead spindle iselastically suspended. with the tubular base member by means of aplurality of endless deformable annular resilient rubber members or0-rings spaced axially with respect to the `bolster and the bore of thebase` and disposed between the outside of the bolster and theencompassing wall of the base, preferably arranged in pairs near eachend ofthe bolster, and further by providing a separate liquid dampingsystem in the form of an oil reservoir formed by the axial rclearancebetween the base and the bolster and sealed at its opposite ends by theresilient rings. Thus, when the rotating spindle structure with itsunbalanced yarn load tends to osclllate about the axis of rotation, theresilient.` rubber members or O-rings flexibly supporting the bolsterand sealingly connecting `it with the base will bedeformed andcompressed and the internal elastic reaction resulting therefrom willsupplement `the oil damping action `set up by the' main oil dampersystem `to act conjointly therewith to produce a centering force,limiting the amplitude of the oscillations of the rotating spindleassembly relative to the base vso that the vibrations will be dampenedin passing through the principal critical speeds in being brought 11p torotation at high speeds, and vice versa.

With this arrangement, the annular resilient rubber members or O-ringsserve a three-fold purpose, viz., as a suspension means flexiblyanchoring the bolster with the base; as a liquid seal for the oildamping fluid ln the reservoir of the liquid damping system; and as amechanical vdamper system to supplement the main or liquid dampingsystem for the spindle during its rotation.

The invention will be more fully set forth in the following descriptionreferring to the accompanying drawings and the features of novelty whichcharacterize the invention Will be pointed out with particularity in theclaims appended to and forming a part of this specification.

I n the drawings: v

Fig. 1 is a sectional elevation of a spindle and mounting thereforeconstructed in accordance with the present invention;

Fig. 2 is an elevation of the tubular bolster, with an end portion shownin section;

Fig. 3 is a section on the line 3-3 of Fig. 1;

Fig. 4 is an enlarged fragmentary sectional elevation of the upper endportion of the spindle and mounting of Fig. l;

Fig. 5 is an enlarged fragmentary sectional elevation ofthe lower endportion of the spindle and mounting of Fig. 1; and

Fig. 6 illustrates one of the O-rings Which is employed for flexiblysuspending and anchoring the bolster Within the base.

Referring to the drawings, the spindle construction show'n in Figs. 1,3, 4 and 5 includes a rotatable blade assembly 9 to be described whichrotates upon anti-friction bearings secured to the upper end portion ofa station-ary upright cylindrical support member or dead spindle shaft26. The main body of the shaft 26 is xedly secured in the bore of abolster or the like tubular member I9 to be described, the tubularbolster being telescopically positioned within and axially occupying theaxial bore of a generally tubular` base or'bolster case I 0 to bedescribed and eX- tending therethrough. The bolster I9 is resilientlyanchored to the base or bolster case I 0 and held from rotation thereinby a resilient mounting arrangement to be described.

The spindle base or bolster case I0 is shown generally tubularthroughout its length, except that it is provided at its upper end withain enlarged hollow ilange II of partially circular formation havingflattened sides I2 and I2 at diametrically opposite positions thereof(see Fig. 3). The flange portion II is integral with the dependingtubul-ar body portion or shank I6 of the base and is counterboredinwardly from its v upper end to provide the enlarged cylindrical recess50 coaxial with and communicating with the main cylindrical bore I8 ofthe body portion or shank I6, the bottom of this recess defining a flatannular shoulder 5I at the upper extremity of the bore of the tubularportion I6, as shown in Fig. 4. The lower end Wall of the base I 0 isprovided with a central aperture 52 which is coaxial with but of smallerdiameter than the main bore I8 of the tubular base portion I6 andprovides a flat annular shoulder 53 interiorly of the body portion orshank I6 terminating the lower end of the bore I8 and bordering thecentral aperture 52.

The base or bolster case I0 is designed to reston the usual spindle railI3 of a spinning frame or a twister frame with the tubular body portionI6 of the base projecting downwardly through the usual circular hole Ilin the rail, and to be clamped thereon by a washer I4 and a nut I5threaded upon the externally screw threaded portion I 6 of the bodyportion or shank I6, as is a well known practice. It is noted that thescrew threaded portion I6 ofthe base or bolster case I8 extends looselythrough the hole I'I in the rail I3 and is made suillciently smaller inexternal diameter than that of the hole II to provide sulcient clearancefor performing the usual cen- 'tering adjustment and the customaryplumbing operation of the base or bolster case I0 on the spindle rail toalign the rotating spindle assem blage with other associated parts ofthe textile machine, as is Well known practice in the art.

The bolster I 9 is of tubular form having an axial bore 25 therethrough,and is telescopically arranged with the bore I8 of the bolster case orbase IG with a loose fit in its operative position, as shown in Figs.1,4 and 5. The bolster is provided at its opposite ends with thecylindrical neck portions 24 and 24 of reduced diameter (see Fig. 2).The bolster, as thus assembled, extends entirely through the base orbolster case IU. That is, the neck portion 24 at the upper end o'f thebolster extends upwardly into and passes through the recess 50 in theflange I I and has its upper end terminating above the top of the flangeII, while the neck portion 21 at the IOWel end of the bolster projectsdownwardly and passes freely through the central aperture 52 at thebottom of the body portion I6 and has its lower end projectingexteriorly beyond the lower end of the bore I 8 and terminating a shortdistance below the exterior bottom face of the bolster case or base I0.

The mounting'for'resiliently supporting and flexibly anchoring thebolster I9 to the tubular base or bolster case I0 consists in thepresent embodiment-of pairs or sets of endless compressible annularresilient members or elastic rings encompassing the outside of the necks24 and 24 respectively of the bolster and disposed within the bore inliquid-tight` sealing contact with the cylindrical internal Wall of saidbore and the cylindrical exterior of the bolster necks 24 and 24'. Inthe present'embodiment, the endless annular resilient or elastic membersare shown as pairs or sets of resilient rubber rings 20, 2I and 22, 23having their convex ends flattened and with their convex outerperipheral faces compressed radially and flattened against theinnerhwall of the bore IS and their respective convex inner peripheralfaces compressed radially and flattened against the outside of thebolster necks 24 and 24 respectively. The resilient rubber rings 28, 2|,22 and 23 are composed of either solid vulcanized natural or syntheticrubber compounds having oil-resisting properties and each in its naturalstate before insertion between the bolster and the base has its bodyround in cross-section. The rubber rings 2IJ, 2I, 22 and 23 employed inthe present spindle construction are the rubber rings commonly referredto as O-rings, and are well known and commercially available moldedrubber products. The rings 20, 2l, 22 and 23 also provide an annularclearance space axially between the bolster' and the base foraccommodating limited lateral I8 of the base and bearing against and*and radial movements of the bolster relative to the base as well asfunctioning as seals for sealing the opposite ends of this axialclearance space to-form a liquid reservoir containing a `quantity of oiland whereof leakage of liquid is to be prevented. this oil functioningas the main damping system to resist and damp the vibrations setup bythe rotating blade `assembly 9 including its load in passing through acritical speed during its running.

The bolster I9 with the assembled O-rings 20, 2|, 22 and 23 is held inthe desired operating position within the bore |8 of the base I0 bymeans of a nat-sided ring or washer 55 and a snap-ring 56 disposedwithin the enlarged recess 50 of the upper flange for retaining theassembly in assembled relation and the O-rings in a compressed flattenedstate.` It will be observed in Fig. 5 that the bottom O-ring 23 oi thelower pair has its convex bottom face pressed into sealing contact withthe flat internal annular shoulder 53 at the lower end of the bolstercase 4 or base IIJ, and that in Fig. 4 the top O-ring 20 of the upperpair or set has its convex top end face in direct contact with andpressed in sealing engagement against the at undersurfacc of the washer55. Consequently, radial compression and flattening of the activesealing surfaces of the Orings 20, 2|, 2'2 and 23 results when axialpressure is applied to the ends of the O`rings as they are distorted bythe washer 55 as it is forced downwardly, when subjected to a downwardthrust, into firm seating engagement with the flat annular shoulder 5|interiorly of the recess 5D and forming its bottom.

The bolster necks 24 and 24' provide with the adjacent Wall of the borei8 and with the lower internal flat annular shoulder 53' and the washer55 respectively a generally rectangular groove or chamber formedcircumferentially proximate to the opposite ends of the bore |8 betweenthe interior Wall thereof and the exterior of the b01- ster necks 24 and24' and arranged to be closed and sealed by a pair of O-rings, theradial and axial cross-sectional dimensions of each of said rectangulargrooves or chambers being less than the diameter in cross-section of thebody of both -rings therein when in their natural unassembled state.

The resilientrubber O-rings 2U, 2|, 22 and 23 are alike as to size andcomposition and each, at their inner and outer points of greatestconvexity, circularwise in the median plane of the particular ring, hasan inner periphery slightly less in circumference than the circumferenceof the cylindrical necks 24 or 24 on which it is assembled, while theexterior peripheral circumference of each O-ring is greater than thecircumference of the interior cylindrical Wall of the bore I8.Consequently, when the O-rings 2|), 2|, 22 or 23 are forced into thebore IB of the basel!) the rubber body of each ring will behighlycompressed radially from `its initial round cross-sectional forminto the cross-sectional shape shown in Figs. 4 and 5 of somewhatellipitical cross-section with iiattened inner and outer peripheral faceportions respectively abutting the exterior of the respective necks '24and 24 and the encompassing internal wall of the tubular body portion I6of the base. In addition, the top and bottom convex end faces of theabutting pairs or sets of O-rings 2U, 2| and 22, 23 are subjected toaxial compression and become attened as shown in Figs. 4 and 5, theupper rings 20, 2| being confined between the washer 55 and the atannular shoulbody, and the lower rings 22, 23 being contlned between theflat annular internal shoulder 53 terminating the bore |8 and the datannular shoulder 58 formed where the bolster neck 24' joins with thelower end of the main bolster body.

The exterior diameter of the bolster I9 is made less than the internaldiameter of the bore I8 so that when the bolster and the bolster caseare assembled the outer periphery of the bolster is spaced radially fromthe interior wall of the bore |8 and an annular clearance space 60 isprovided axially between the bolster and the base constituting an oilchamber or reservoir holding a supply of oil ample to create an oildamping action suflicient to provide the main damping system for thespindle and which acts conjointly` Y with the mechanical damping actionprovided. l by the resilience and expansive characteristics* of theresilient rubber O-rings to suppress, damp and cushion the vibratory oroscillatory movements of the vbolster imparted thereto by the rotatingspindle assembly relative to the base in passing through a criticalspeed incident to ro tation at high speeds.

The oil damping action is facilitated by theV fact that this annularclearance space between the bolster I9 and the bore `|8 of the bas'ecrbolster case forming the oil chamber or reservoir BIJ is made verysmall, and that satisfactory damping action is obtained with a clearanceof in the' neighborhood of from ten to twentythousandths of an inchbetween the main body of the bolster and the interior wall of the borei8. Also, this order of clearance prevents too tight squeezing laterallyof the elastic O-rings when being adjusted to the desired positionwithin the bore.

As shown in Fig. 2 the body portion of the bolster i9 is ofsubstantially uniform exterior diameter except that at `uniformly spacedintervals axially therealong the outside surface of the bolster body isformed with a multiplicity of annular grooves 6| which provide increasedcapacity to the oil chamber or reservoir 6|] between the bolster and thebase when assembled. In this construction, there are shown nine suchindividual circumferential grooves 6| about the bolster body.

Mounted in the bolster I9, after the bolster and base aretelescopicallyarranged in assembled position one within the other and iiexiblyanchored and sealingly connected by the Orings, is the non-rotatablesupport member or dead spindle shaft 26, the main body portion or shank2B of which is accurately machined to fit snugly into the bore 25 of thebolster. The support member or shaft 2E is shown provided with ashoulder or collar 21 arranged at an intermediate portion, see Fig. 1,while the body portion or shank` 26' extending below this shoulder orcollar is made of greaterlength than the bolster bore 25 so that theshank 25' extends entirely through the bore 25 when the spindle shaft 26is mounted in its operative position within the bolster.

The support member or shaft 26 is held fixed or stationary by beingclamped to the ends of the bolster |9 between the underside of theshoulder or collar 21 and a washer 29, as shown in Figs. 1 and 5, andwhich, in turn, is held clamped against the lower end of the bolster I9upon tightening of the elastic lock nut 28 threaded upon the screwthreaded lower extension 30 of shank portion 26'.

The support member or shaft 23 also has in- Awith the spindle blade 42.The whorl is recessed at its under side, as at 43, to provide adepending annular belt-receiving skirt 44 whereby both ball bearingunits 33 and 34 are entirely housed within the interior of the whorl.The lower end of the recess 43 is counterbored to provide the y innerannular shoulder 45. The outer race ring of the upper ball bearing 33engages against a spacer ring 46 abutting the shoulder 45 while a lockring 4l secures the outer race ring of the lower ball bearing with thewhorl. The inner and outer race members of the ball bearing umts 33 and34 respectively preferably are secured by a snug press-fit to the whorland the stem respectively. If desired, injection lubricated type ballbearing units may be utilized in lieu of the double seal type ballbearing units 33 and 34 illustrated in the drawings by appropriatemodication of the whorl to provide convenient apertures for insertion ofthe hollow grease injecting needle into the bearing lubricatingapertures. The whorl 40 and the blade member 42 thus are arranged forfree rotation upon the stem portion 3l of the support member or deadspindle shaft 26.

The washer 29 is installed as shown and has the marginal material of itsinner end face v bounding its central hole in contact with the lower endof the bolster I8, as shown in Fig. 5. Suitable clearance is providedbetween the lower end ofthe base l and the inner end face of the washer23, as indicated at 48, to enable limited axial movement of the bolsterunder conditions of overload for safety purposes or of shock whendoiling.

The lock nuts 28 and 3B preferably are of a `commercial type known inthe trade a: elastic Stop Nuts incorporating in their structure alocking collar of vulcanized fiber and are a product manufactured by theElastic Stop Nut Corporation of America, Union, New Jersey.

From `the foregoing description it will be seen that the spindle mountorganization provides a combined damper, seal and r;silient mount forthe rotating spindle structure which supplements the oil damping systemand acts conjointly therewith to resist and/or damp and suppress theoscillatory and/or gyratory movements of the dead spindle and thebolster imparted thereto and created by the rotating parts of thespindle structure and its yarn load.

What is claimed is:

1. in combination, a pair of coaxial tubular members telescopicallyarranged one within the other with a loose t, endless resilient rubberrings disposed between said tubular members, each of said rings in itsnatural state having its body substantially round in cross-section, saidrings upon assembly of said tubular members one within the otherfiexibly anchoring said members together and providing an annularclearance space axially between the tubular members for accommodatinglimited lateral movements of thev inner member relative to the outermember, said rings also having their convex inner and outer peripheralfaces compressed radially and bearing iirmly against the outside of saidinner tubular member and the internal peripheral wall ofthe outertubular member respectively, and means for retaining the assembly inassembled relation and said rings in a radially compressed state.

2. In combination. a pair of coaxial tubular members telescopicallyarranged one within the other with a loose t, endless resilient rubberrings disposed between said tubular members, each of said rings in itsnatural state having its body substantially round in cross-section, saidrings upon assembly of said tubular members one within the otherflexibly anchoring said members together and providing an annularclearance space axially between the tubular members for accommodatinglimited lateral movements of the inner member relative to the outermember, said rings also having their convex inner and outer peripheralfaces compressed radially and in sealing contact with the outside ofsaid inner tubular member and the internal peripheral wall of the outertubular member respectively and sealing the opposite ends of saidannular clearance space to form a liquid reservoir wherefrom leakage ofliquid is to be prevented, a liquid medium in said reservoir, and meansfor retaining the assembly in assembled relation and said rings in aradially compressed state.

3. In combination, a pair of coaxial tubular members telescopicallyarranged one within the other with a loose fit, endless resilient rubberrings ldisposed between said tubular members and flexibly anchoring theinner tubular member with said outer tubular member, each of said ringsin its natural state having its body round in cross-section, said ringsupon assembly of said tubular members one within the other having theirconvex ends flattened and their convex inner and outer peripheral facesin contact respectively with said inner and outer tubular membersflattened and providing an annular clearance space axially between thetubular members and also sealing the opposite ends of said clearancespace to form a liquid reservoir wherefrom leakage of liquid is to beprevented, a liquid medium in said reservoir, and means for retainingthe assembly in assembled relation and said rings in a compressedflattened state.

4. A textile spindle comprising a generally tubular base member havingan axial bore therethrough, a tubular bolster carried in substantiallycoaxial relation within the bore of said base member, endless annularresilient members between said bolster and said base member and ilexiblyanchoring said bolster with said base member and providing an annularclearance space axially therebetween for accommodating limited lateraland radial movements of the bolster relative to the base member, saidannular resilient members being compressed radially and bearing againstthe outside of said bolster and the adjacent wall of the bore of saidbase member, and means for retaining the assembly in assembled relationand said annular resilient members in a radially compressed state.

5. A textile spindle comprising a generally tubular base member havingan axial bor therethrough, a tubular bolster carried in substantiallycoaxial relation within the bore of said base member, a plurality ofendless resilient /rubber rings arranged in pairs at axially spacedlocations along said bolster between said bolster and said base andproviding an annular clearance space axially therebetween foraccommodating limited lateral movements ofthe bolster relative to thebase member, each oi said rings being compressed radially and bearingagainst the outside of said bolster` and the adjacent wall of the boreof said base member to form a liquid-tight seal therewith, said ringssealing the opposite ends of said annular clearance space to form aliquid reservoir wherefrom leakage of liquid is to be prevented, aliquid medium in said reservoir, and means for retaining the assembly inassembled relation and said rings in a radially compressed state.

6. A textile spindle comprising a generally tubular base member havingan axial bore therethrough, a tubular bolster axially occupying saidbore and extending therethrough, there being an annular clearance spaceaxially between the exterior of said bolster and the encompassing wallof said base, a plurality of endless annular resilient members disposedwithin said bore about said bolster and sealingly connecting saidbolster with said base, said annular resilient members sealing theopposite ends of said annular clearance space to form a liquid reservoirand wherefrom leakage of liquid is to be prevented, liquid in saidreservoir, said annular resilient members being compressed with theiractive sealing surfaces flattened, and means for retaining the assemblyin assembled relation and said annular resilient sealing members in acompressed ilattened state, said annular resilient members eachfunctioning as a resilient mount iiexibly anchoring said bolster to saidbase, as a liquid `seal for the liquid damping system of the spindle,and as a supplemental damper for the spindle acting conjointly with theliquid clamping system to suppress and damp the vibrations oroscillations of the rotating spindle assembly relative to the base inpassing through a. critical speedlincident to rotation at high speeds.

7. A textile spindle comprising a generally tubular base member havingan axial bore therethrough, a tubular bolster axially occupying saidbase and extending therethrough, there being a-n annular clearance spaceaxially Ibetween `the exterior of said bolster and the encompassing wallof said base, a plurality of rubber O-rings dis posed within said boreabout said bolster and sealingly connecting said bolster with said base,said O-rings sealing the opposite ends of said annular clearance spaceto form a liquid reservoir between said bolster and said base, aquantity of a liquid medium in said reservoir surrounding said bolster,the `liquid functioning as the main damping system of the spindle andserving to create a damping action for suppressing or limiting radialand torsional vibrations or oscillatory movements set up by the rotatingspindle structure in passing through a critical speed in its rotation athigh speeds, said O-rings being compressed with their active sealingsurfaces flattened, and means for retaining the assembly in assembledrelation and said O-rings in a compressed flattened state, said O-ringsfunctioning as a resilient mount flexibly anchoring said bolster to saidbase, as a liquid seal for the liquid damping system of the spindle, andas a supplemental damper for the spindle acting'conjointly with theliquid damping system to suppress and damp the vibrations oroscillations of the rotating spindle assembly relative to the base inpassing through a critical speed incident to rotation at high speeds.

8. In a spinning or twister spindle, the combination with a base havinga tubular portion, a` tubular bolster axially occupying the bore of saidtubular base portion and loosely fitting said bore.

of a combined seal and resilient mount organization for flexiblysupporting said bolster in said tubular base portion to accommodaterelative lateral and axial movements to a limited extent between saidbolster and said base and sealing the axial clearance between thebolster and the base at opposite ends of said bore whereof leakage of aliquid medium is to be prevented com-` prising an internal flat annularshoulder in the bore of said tubular base portion at the lower endthereof, a pair of rubber O-rings encompassing the lower end of saidybolster within the bore oi!` said base ln sealing engagement with eachother and sealingly connecting said bolster and said base, the bottomO-ring being pressed into sealing contact with said internal shoulder, asecond pair of 0-rings encompassing the upper end of said bolster withinthe bore of said base and pressed into sealing engagement with eachother and sealingly connecting said bolster and said base, a nat-sidedring contacting and in sealing engagement with the upperD-ring of saidsecond pair of rings, and a snap ring for retaining the assembly inassembled relation and said O-rings in a compressed state.

9. In a textile spindle. the combination with a base having a tubularportion. a tubular bolster axially occupying the bore of said tubularbase portion and loosely fitting said bore, there being an enlargedannular recess in said base communicating with the upper end of saidbore and coaxial therewith, the bottom of said recess denning a. flatannular shoulder at the upper .extremity of said bore. of a combinedseal and resilient mount organization for flexibly supporting saidbolster in said tubular base portion to accommodate relative lateral andaxial movements to a limited extent between said bolster and said baseand sealing the axial clearance between the bolster and the base atopposite ends of said .bore whereof leakage of a liquid medium is to beprevented comprising an internal flat annular shoulder in the bore ofsaid tubular base portion at the lower end thereof, a pair of rubberO-rings encompassing the lower end of said bolster within the bore ofsaid base in sealing engagement with each other and sealingly connectingsaid bolster and said base, the bottom O-ring being pressed into sealingcontact with said internal shoulder, a second pair of 0-ringsencompassing the upper end of said bolster within the bore of said baseand pressed into sealing engagement with each other and sealinglyconnecting said bolster and said base, a washer contacting and insealing engagement with the upper O-ring of said second pair of ringsand seated upon the shoulder of said enlarged upper recess, and a snapring for retaining the assembly in assembled relation andsaid O-rings ina compressed state.

lO. A textile spindle comprising a tubular base having an axial boretherethrough and presenting at its upper end an enlarged flange providedwith an enlarged cylindrical recess coaxial with and communicating withthe upper end of said i bore, the bottom of said recess defining a fiatannular shoulder at the upper extremity of said bore, the lower end ofsaid base having an internal iiat annular shoulder bordering a centralaperture of smaller diameter than said bore and terminating the lowerend of said base, a tubular bolster arranged in substantially coaxialrelation within the bore of said base, said bolster being provided atits opposite end portions with reduced'A cylindrical neck portions, theneck at the lower end of said bolster projecting downwardly and passingfreely through the central aperture and terminating exteriorly of saidbase, the neck: at the upper end of said bolster extending through saidannular recess in the upper flange, annular resilient members spacedaxially with respect te said bolster and said bore and disposed betweenthe bolster and the base member, said annular resilient members flexiblyanchoring said bolster with said base and in sealing contact with theinner wall of said base and the outside of said bolster, said resilientmembers being in g state oi.' radial compression with their activesealing faces flattened, the arrangement being such that said annularresilient members provide axial clearance between said bolster and saidbase to form a liquid reservoir and to seal the opposite ends thereof,and a liquid medium in said reservoir surrounding the bolster andserving to create a damping action which combined with that created bythe elastic action of the annular resilient members damp or suppress thevibrations of the rotating spindle assembly relatively to the base inpassing through a critical speed incident to rotation at high speeds.

1l. A textile spindle comprising a, generally tubular base member havingan axial bore therethrough and an internal fiat annular shoulder at thelower end of said bore, there being an enlarged cylindrical recess insaid base at the top end of said bore defining a fiat annular shoulder,a tubular bolster axially occupying said bore, said bolster havingreduced cylindrical neck portions at its opposite ends and a bodyportion adapted to have a loose ilt in the bore of said base, said upperbolster neck projecting into said enlarged recess and said lower neckprojecting exteriorly beyond the lower end of said bore and its internalflat annular shoulder, a at washer encompassing the upper bolster neckand seated against the nat annular shoulder in said enlarged top recess,a pair of compressible endless resilient rubber rings mounted on each ofsaid neck portions of said bolster and disposed between the exteriorthereof and the internal wall of the bore of said base, each of saidrings in its natural state having its body substantially round incross-section, said rings upon assembly of said bolster in said baseproviding an annular clearance space axially between said bolster andsaid base. said bolster necks providing with the adjacent wall of saidbore and with said lower internal flat annular shoulder and said washerrespectively a generally rectangular groove formed circumferentiallyproximate to the opposite ends of said bore between the wall thereof andsaid necks and arranged to be closed by said rings, the radial and axialcross-sectional dimensions of each of said grooves being less than thediameter in cross-section of the body of the rings in' their naturalunassembled state, said rings being radially and axially compressedduring assembly of said bolster in said base and having their convex endfaces flattened and their convex inner and outer peripheral faces incontact respectively with the exterior of said bolster and the adjacentinner wall of said b'ore flattened whereby the rings in tending toreturn to their natural round cross-sectional form are pressed radiallyinto sealing contact with said base and lsaid bolster, and means in saidenlarged recess maintaining said washer in contact with the topmostsealing ring and firmly seated against the shoulder of said recess forretaining the assembly in assembled relation and said sealing rings in acompressed attened state.

LESTER E. KEENE. FAUSTO G. DE SANTIS.

REFERENCES CITED Name Date Keene et al Aug. 16, 1949 Number

